Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd16ca6d0aad417c…

MALICIOUS

PDF

80.2 KB Created: 2021-09-06 12:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6238185387f600467c72c3ffdefa3052 SHA-1: f425e12bd054ab64bd019da27c4ef54594e196bb SHA-256: bd16ca6d0aad417c10d62f63ac8922f33c51e041302a18e0f6242d8e3add7fb7
104 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, some of which are identified as compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final destination. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://babyindex.nl/images/uploads/ripobev.pdf In PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/xikavebonewoxosa.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/lawixawamokufexaviwux.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/xazigu.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/524a8bcc2eb57655e6272e88733c8524/73738915136.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/53078210796.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/niwutifibaduvemepodotubat.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/22711865821.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/liridakiralewox.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/5fb6efafce4d827e2d324f47ca68fdeb/wonenadapimuzi.pdfIn PDF document text
    • https://manenshop.com/upload/files/wudujakuberabumomug.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/fukibaxezuruniwuzeperoz.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/75398879547.pdfIn PDF document text
    • http://benetalent.com/upload/files/36286416195.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/5433062495.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/21480130872.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcd8d08e91---woremobulinerewit.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/35267726721.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/77980221840.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/34218631316.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb00945d98---99607636034.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/87298316484.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pathfinder+pawns+bestiary+box+6+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD401 11160 bytes
SHA-256: d1c58cd99f67d72bee28e9a11e437932805af126f4095591bf33efee2c2af7fc
font_01_sfnt_off0000ede4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F6 17416 bytes
SHA-256: 7ddbde70cfc09a52bb2f4cd4aa91c804ea40c43afdb12e4a610f15120ef0cd50